Vermont Castings Defiant FlexBurn Homeowner's Installation And Operating Manual page 6

Defiant ® FlexBurn ™ 1975 Non-Catalytic / Catalytic Woodburning Stove
what kind of chimney to Use
You must connect the Defiant to a code-approved masonry
chimney with a flue liner, to a relined masonry chimney that
meets local codes, or to a prefabricated metal chimney that
complies with the requirements for Type HT chimneys in
the Standard for Chimneys, Factory-Built, Residential Type
and Building Heating Appliance, UL 103. Figure 3 illustrates
the two types. The chimney and chimney connector must
be in good condition and kept clean.
If you use an existing masonry chimney, it must be in-
spected to ensure it is in a safe condition before the stove
is installed. Your local professional chimney sweep, building
inspector, or fire department official will be able to inspect
the chimney or provide a referral to someone who can.
See "Chimney and Fireplace hazards", in the appendix,
for particulars.
A prefabricated double-
wall insulated chimney
A tile-lined
masonry
chimney
ST241
Fig. 3 Approved chimney types.
The chimney must extend at least 3' (914 mm) above the
highest point where it passes through or near a roof, and at
least 2' (610 mm) higher than any part of a building within
ST241
chimney types
10' (3 m) horizontally. (Fig. 4)
12/13/99 djt
For proper draft and good performance, any chimney used
with a Defiant should extend at least 16' (5 m) above the
flue collar of the stove.
0 To 10'
2' Min.
3'
Min.
Reference
Point
Fig. 4 The 2'-3'10' Chimney Rule.
AC617
RLTSKC8
6
2/11/98
0 To 10'
2' Min.
3'
Min.
AC617
Masonry chimneys
An inspection of the chimney must confirm that it has a lin-
ing. Do not use an unlined chimney. The chimney should
have no cracks, loose mortar, other signs of deterioration,
and blockage. Repair any defects before the chimney is
used with your stove.
Unused openings in an existing masonry chimney must
be sealed with masonry to the thickness of the chimney
wall, and the chimney liner should be repaired. Openings
sealed with pie plates or wallpaper are a hazard and should
be sealed with mortar or refractory cement. In the event
of a chimney fire, flames and smoke may be forced out of
these unused thimbles.
The chimney should be thoroughly cleaned before use.
A newly-built masonry chimney must conform to the stan-
dards of your local building code or, in the absence of a
local code, to a recognized national code. Masonry chim-
neys must be lined, either with code-approved masonry or
pre-cast refractory tiles, stainless steel pipe, or a code-ap-
proved, "poured-in-place" liner. The chimney's clean-out
door must seal tightly. A loose or leaky clean-out door can
weaken chimney draft, causing performance problems.
prefabricated chimneys
A prefabricated metal chimney must be one tested and
listed for use with solid-fuel burning appliances to the
High-Temperature (H.T.) Chimney Standard UL-103-1985
(2100°F) for the United States, and High Temperature
(650°C) Standard ULC S-629 for Canada.
Do NoT coNNecT ThiS UNiT To a chiMNey FlUe
SeRviNg aNoTheR appliaNce.
chimney Size
A Defiant with an 8" (203 mm) flue collar is approved for
venting into a masonry chimney with a nominal flue size
of 8" x 8" (203 x 203 mm) or 8" x 12" (203 x 305 mm), and
into a round flue with nominal flue size of 8" (203 mm). A
Defiant with a 6" (152 mm) flue connector is approved for
venting into a masonry chimney with a nominal flue size of
8" x 8" (203 x 203 mm), and into a round flue with nominal
flue of 6" (152 mm).
NoTe: when installed with a 6" flue collar, the Defiant
may not be operated with the front doors open.
Whatever the flue collar size, a Defiant may be vented into
larger chimneys as well. However, chimneys with liners
larger than 8" x 12" (203 x 305 mm) may experience rapid
cooling of smoke and reduction in draft, especially if the
chimneys are located outside the home. These large chim-
neys may need to be insulated or have their flues relined
for proper stove performance.
30005220